Sound

These animals communicate by making sounds lower than 20 vibration per second.

8.

The back and forth movement of matter.

9.

A form or energy that travels through the air.

Down

1.

Animals that can hear sounds higher than 25,000 vibrations per second.

2.

The type of wave sound travels as.

3.

The number of vibrations per second a sound makes.

4.

The sound made when sound waves bounce off a solid surface.

8.

The loudness of a sound.

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